Submarine signaling



June 24, 1930. H. c. HARRlSON I SUBMARINE SIGNALING Filed Dec. 29, 1.919.v

Patented June 24, 1930 NITED- sTATEs- ATENT- OFFICE HENRY o. HARRISON, or PORT WASHINGTON, NEW YORK, AssIeNOR To WESTERN ELECTRIC COMPANY, INCORPORATED, NEW YORK on NEW. YORK, N. Y., A OORPORATION OR sUBMARINE SIGNALING Application filed llecember 29, 19 19. vSerial No. 848,107.

This invention relates to submarine signallng and more particularly to a vibration responsive device adapted to be submerged under water for detaching or receiving vibra- 5 tions set up in the water by submarlne signaling apparatus or by the submarine vessel.

Various types of detecting devices. employingdiaphragms-have been proposed for movement of a use under water in which a diaphragm is arranged to be set in vibrationby sound waves lmparted to the water by submerged sound signaling apparatus or by the action, of the.

propeller or the movement of avessel through the water. Such devices, however,*have been Open to the. objection that unless some com pensating device is provided, the hydro static pressure acting on the diaphragm when the device is submerged is sufiicient to bowv the P diaphragm inward and destroy the adjustment of the apparatus if an electromagnetic unit'is used, and in addition, to cause packing if a unit of the microphonic type is employed. With such devices, trouble has also been experienced due to the danger of destroying the sensitive adjustment necessary unless the apparatus is handled with extreme care.

It is the object of the present invention to provide a vibration responsive device so arranged that the adjustment or sensitiveness of the apparatus will not be impaired as a result of the hydrostatic. pressure acting upon the diaphragm when the device is submerged and also arranged so that extreme care need not be exercised in handling the apparatus.

To accomplish these objects in accordance with a feature of this invention, the translating device which is connected directly to the center of the diaphragm and may be of either the electromagnetic or the microphonic type is pivotally mounted approximately through its center of mass.

This and other features of the invention may be more clearly understood by reference to the accompanying drawing in which Fig. 1 is a sectional view of a detecting device em bodying the features of this invention and Fig. 2 is a sectional view along the lines 2-2 of Fig. 1 looking i the d rection of the small arrows.

Referring to the drawing, there is provided a cup-shaped casing 5 having a flanged portion 6', against which an end plate7 and diaphragm 8 are securely clamped by means of a clamping ring'9, the various parts being clamped together by means of the bolts 10 and nuts 11.. ,Agasket 12 of soft rubber or-.

sifnilar material is located, as shown, between the flanged portion 6 and end plate 7 and a similargasket 13 is located between the end plate 7 and diaphragm 8, these gaskets being provided to prevent the entrance of water within the casing. The center of end plate 7 is provided with a pcrforation 14 and extending therethrough is a rod 15, one end of which is secured to the center of the diaphragm while the other end is rigidly-secured to the 8 end of armature 16'ofan electromagneticv unit. This electromagnetic unit comprises a plurality of E-shaped punchin s 17 which are securely clamped together etween the side plates 18 and 19 by means of thescrews 2020, a pair of spacer, blocks 212l being provided, as shown, to provide space for the coils 2222 upon which are located the operating windings 3232 and the polarizing windings 3333. The armature 16 is resiliently supported at its central point by means of the spring23, the ends of which are rigidly fastened to the side plates 18 and 19. The end-plate 7 is provided with a pair of rightangled extension members 24'-24= on Which the electromagnetic unit is adapted to he 'pivotally mounted. These members are provided with threaded openings from which extend the trunnion screws 2525, the ends of which are tapered, as shown, and adapted to engage the ball-bearings 2626 located in the side plates 18 and 19. Lock nuts 27-27 are provided to hold the trunnion screws 1n position when once adjusted satisfactorily.

Projections 28-28 are provided on the side plates 18 and 19 to limit the amount of rotation of the electromagnet by serving as stops to engage the end plate 7 At thQ bElCl-O f casing 5, a boss 29 is provided which is internally threaded to engage similar threads 1n the pipe 30 which is-used for suspendlng the apparatus in position.- The conductors Ell-#31 are led through the pipef 30,-.Q e pair extending to the terminals of the operating windings 32-32 and the other pair extending to the terminals of the polarizing WlIldings 33-33.

Vibrations of the diaphragm 8 cause corresponding movements of armature 16 and, with current flowing through the windings 33-33 corresponding variations are set up in the current flowing through the windings 32-32. Since the electromagnetic unit itself is pivotally mounted, any change in hydrostatic pressure which tends to bow the diaphragm inward or outward will tend to rotate the electromagnet about the trunnion screws 725-25 and will not affect the space relation between the armature 16 and the core portions of the coils 22. However, vibrations of the diaphragm 8 in response to Vibrations in the water resulting from submarine signaling apparatus or the movements of a submarine vessel are of comparatively high frequency and will cause corresponding' movement of the armature 16 without causing rotation of the electromagnetic unit itself. Since this unit is pivotally mounted approximately through its center of mass, there is little danger of loss of adjustment due-to careless handling. The space between the projections 28-28 and the end plate 7 is great enough to'allow the unit to rotate freely in response to the bowing of the diaphragm underthe maximum conditions to be expected in service.

What is claimed is;

1. A translating device .for sound wave energy comprising an inertia member including an electro-magnetic device; adiaphragm; means connecting said diaphragm to said inertia member, said connecting means comprising an armature and resilient means supporting said armature on said inertia member and in operative relation to said electro-magnetic device; a mounting, and means rotatably supporting said in ertia member on said mounting and for movement in a fixed path with said diaphragm.

2. A translating device for sound wave energy comprising an inertia member including an electro-magnetic device; a dia-' phragm; means connecting said diaphragm to said inertia member, means comprising an armature and resilient means supporting said armature on said inertia member and in operative relation to said electro-magnetic device; a mounting,

means rotatably supporting said inertia member; on said mounting and means for limiting the rotation of said inertia member.

3. A translating device for sound wave energy comprising an inertia member including a magnet a diaphragm; means connectmeans on said casing said connectmg armature on said inertia member and in biased relation to said magnet; a mounting, and means pivotally supporting said inertia member on said mounting the axis of the pivots passing through the center of mass of said inertia member.

4. A translating device for sound wave energy, a casing including a diaphragm as one wall thereof; inertia means including means to vary the conditions in an electrical circuit, means connecting said diaphragm to said circuit varying means, said connecting means including a vibratory member and resilient means for supporting said member iii biased relation to said inertia means; and means rotatably supporting said inertia for movement relative thereto and with the center of said diaphragm at all times.

5. In a device for the transmission of sound wave energy comprising a casing including as a wall portion a diaphragm; means in said casing for converting vibrating movements into electrical current variations including an electro-responsive device; a member movable relative thereto including means mounting the latter for movement and for resiliently biasing it with respect to the former; means rotatably mounting said converting means on said casing for movement with the center of said diaphragm in a fixed path and means connnecting said converting means with the diaphragm including the mounting and biasing means of the movable member of the electro-responsive device and a rigid connection between said member and the diaphragm; said converting means and the means connecting the diaphragm thereto including inertia means.

In witness whereof, I hereunto subscribe my name this 20th day of December 1).,

ing said diaphragm to said inertia member, 1

said connecting means comprising an armature and resilient means supporting said 

